diff --git a/src/notifications.js b/src/notifications.js
index fd0d01ce55..ef7e813a95 100644
--- a/src/notifications.js
+++ b/src/notifications.js
@@ -549,7 +549,7 @@ Notifications.merge = async function (notifications) {
 					const type = typeFromLength(usernames);
 					const isMultiple = type === 'multiple';
 					const txArgs = [
-						`${mergeId}-${type}`,
+						`${mergeId}${type ? `-${type}` : ''}`,
 						...usernames.slice(0, usernames.length <= 3 ? 3 : 2),
 						...(isMultiple ? [usernames.length - 2] : []),
 						notifObj.roomIcon,
@@ -570,7 +570,7 @@ Notifications.merge = async function (notifications) {
 					const type = typeFromLength(usernames);
 					const isMultiple = type === 'multiple';
 					const txArgs = [
-						`${mergeId}-${type}`,
+						`${mergeId}${type ? `-${type}` : ''}`,
 						...usernames.slice(0, usernames.length <= 3 ? 3 : 2),
 						...(isMultiple ? [usernames.length - 2] : []),
 						utils.decodeHTMLEntities(notifObj.topicTitle || ''),